Artículo de revista
Effects of labile phosphorous and carbón on non-symbiotic N 2 fixation in logged and unlogged evergreen forests in Chiloé Island, Chile Efectos del fósforo y carbono lábiles en la fijación no simbiótica de N2 en hojarasca de bosques siempreverdes manejado
Fecha
2008Registro en:
Revista Chilena de Historia Natural, Volumen 81, Issue 2, 2018, Pages 267-278
0716078X
07176317
Autor
Pérez, Sandra E.
Pérez, Cecilia A.
Carmona, Martín R.
Fariña, José M.
Armesto, Juan J.
Institución
Resumen
Nitrogen input to evergreen températe forests of Chiloé Island, Chile occurs predominantly via non-symbiotic fixation (NSF). Because this is a bacterial-mediated process (diazotrophs), in addition to environmental factors (e.g., temperature and moisture), phosphorous availability and energy supply from carbón in the substrate may influence the rates of N fixation. Our hypothesis is that if both phosphorous and carbón are limiting NSF, this limitation would be greater in logged forests, where additions of labile P and C would stimulate microbial activity. Our objectives are to assess the effects of inorganic phosphorus and labile carbón (as glucose) additions (0 mmol P/L, 0.645 mmol P/L, 3.23 mmol P/L y 6.45 mmol P/L and 0 mmol P/L, 23.3 mmol C/L, 46.6 mmol C/L y 70 mmol C/ L, respectively) on the rates of NSF measured in the litter layer of each forest in laboratory assays, under controlled temperature and moisture and using homogeneous litter samples. We studied lowland evergreen rain